The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
B Michon - One of the best experts on this subject based on the ideXlab platform.
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wiedemann franz law and Abrupt Change in conductivity across the pseudogap critical point of a cuprate superconductor
Physical Review X, 2018Co-Authors: B Michon, Amirreza Ataei, Patrick Bourgeoishope, Clement Collignon, Sven Badoux, Adrien Gourgout, Francis Laliberte, Jianshi Zhou, N DoironleyraudAbstract:Measurements of thermal conductivity in a cuprate reveal new details about the enigmatic pseudogap phase, demonstrating that at absolute zero this phase is metallic with a low carrier density.
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wiedemann franz law and Abrupt Change in conductivity across the pseudogap critical point of a cuprate superconductor
arXiv: Superconductivity, 2018Co-Authors: B Michon, Amirreza Ataei, Patrick Bourgeoishope, Clement Collignon, Sven Badoux, Adrien Gourgout, Francis Laliberte, Jianshi Zhou, N DoironleyraudAbstract:The thermal conductivity $\kappa$ of the cuprate superconductor La$_{1.6-x}$Nd$_{0.4}$Sr$_x$CuO$_4$ was measured down to 50 mK in seven crystals with doping from $p=0.12$ to $p=0.24$, both in the superconducting state and in the magnetic field-induced normal state. We obtain the electronic residual linear term $\kappa_0/T$ as $T \to 0$ across the pseudogap critical point $p^{\star}= 0.23$. In the normal state, we observe an Abrupt drop in $\kappa_0/T$ upon crossing below $p^{\star}$, consistent with a drop in carrier density $n$ from $1 + p$ to $p$, the signature of the pseudogap phase inferred from the Hall coefficient. A similar drop in $\kappa_0/T$ is observed at $H=0$, showing that the pseudogap critical point and its signatures are unaffected by the magnetic field. In the normal state, the Wiedemann-Franz law, $\kappa_0/T=L_0/\rho(0)$, is obeyed at all dopings, including at the critical point where the electrical resistivity $\rho(T)$ is $T$-linear down to $T \to 0$. We conclude that the non-superconducting ground state of the pseudogap phase at $T=0$ is a metal whose fermionic excitations carry heat and charge as conventional electrons do.
Alistair G L Borthwick - One of the best experts on this subject based on the ideXlab platform.
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recent Changes of water discharge and sediment load in the yellow river basin china
Progress in Physical Geography, 2010Co-Authors: Chiyuan Miao, Alistair G L BorthwickAbstract:The Yellow River basin contributes approximately 6% of the sediment load from all river systems globally, and the annual runoff directly supports 12% of the Chinese population. As a result, describing and understanding recent variations of water discharge and sediment load under global Change scenarios are of considerable importance. The present study considers the annual hydrologic series of the water discharge and sediment load of the Yellow River basin obtained from 15 gauging stations (10 mainstream, 5 tributaries). The Mann-Kendall test method was adopted to detect both gradual and Abrupt Change of hydrological series since the 1950s. With the exception of the area draining to the Upper Tangnaihai station, results indicate that both water discharge and sediment load have decreased significantly (p<0.05). The declining trend is greater with distance downstream, and drainage area has a significant positive effect on the rate of decline. It is suggested that the Abrupt Change of the water discharge from...
N Doironleyraud - One of the best experts on this subject based on the ideXlab platform.
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wiedemann franz law and Abrupt Change in conductivity across the pseudogap critical point of a cuprate superconductor
Physical Review X, 2018Co-Authors: B Michon, Amirreza Ataei, Patrick Bourgeoishope, Clement Collignon, Sven Badoux, Adrien Gourgout, Francis Laliberte, Jianshi Zhou, N DoironleyraudAbstract:Measurements of thermal conductivity in a cuprate reveal new details about the enigmatic pseudogap phase, demonstrating that at absolute zero this phase is metallic with a low carrier density.
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wiedemann franz law and Abrupt Change in conductivity across the pseudogap critical point of a cuprate superconductor
arXiv: Superconductivity, 2018Co-Authors: B Michon, Amirreza Ataei, Patrick Bourgeoishope, Clement Collignon, Sven Badoux, Adrien Gourgout, Francis Laliberte, Jianshi Zhou, N DoironleyraudAbstract:The thermal conductivity $\kappa$ of the cuprate superconductor La$_{1.6-x}$Nd$_{0.4}$Sr$_x$CuO$_4$ was measured down to 50 mK in seven crystals with doping from $p=0.12$ to $p=0.24$, both in the superconducting state and in the magnetic field-induced normal state. We obtain the electronic residual linear term $\kappa_0/T$ as $T \to 0$ across the pseudogap critical point $p^{\star}= 0.23$. In the normal state, we observe an Abrupt drop in $\kappa_0/T$ upon crossing below $p^{\star}$, consistent with a drop in carrier density $n$ from $1 + p$ to $p$, the signature of the pseudogap phase inferred from the Hall coefficient. A similar drop in $\kappa_0/T$ is observed at $H=0$, showing that the pseudogap critical point and its signatures are unaffected by the magnetic field. In the normal state, the Wiedemann-Franz law, $\kappa_0/T=L_0/\rho(0)$, is obeyed at all dopings, including at the critical point where the electrical resistivity $\rho(T)$ is $T$-linear down to $T \to 0$. We conclude that the non-superconducting ground state of the pseudogap phase at $T=0$ is a metal whose fermionic excitations carry heat and charge as conventional electrons do.
Chiyuan Miao - One of the best experts on this subject based on the ideXlab platform.
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recent Changes of water discharge and sediment load in the yellow river basin china
Progress in Physical Geography, 2010Co-Authors: Chiyuan Miao, Alistair G L BorthwickAbstract:The Yellow River basin contributes approximately 6% of the sediment load from all river systems globally, and the annual runoff directly supports 12% of the Chinese population. As a result, describing and understanding recent variations of water discharge and sediment load under global Change scenarios are of considerable importance. The present study considers the annual hydrologic series of the water discharge and sediment load of the Yellow River basin obtained from 15 gauging stations (10 mainstream, 5 tributaries). The Mann-Kendall test method was adopted to detect both gradual and Abrupt Change of hydrological series since the 1950s. With the exception of the area draining to the Upper Tangnaihai station, results indicate that both water discharge and sediment load have decreased significantly (p<0.05). The declining trend is greater with distance downstream, and drainage area has a significant positive effect on the rate of decline. It is suggested that the Abrupt Change of the water discharge from...
Vijay P Singh - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the significance of Abrupt Changes in precipitation and runoff process in china
Journal of Hydrology, 2018Co-Authors: Ziyi Wu, Yanfang Sang, Haiting Gu, Vijay P SinghAbstract:Abstract Abrupt Changes are an important manifestation of hydrological variability. How to accurately detect the Abrupt Changes in hydrological time series and evaluate their significance is an important issue, but methods for dealing with them effectively are lacking. In this study, we propose an approach to evaluate the significance of Abrupt Changes in time series at five levels: no, weak, moderate, strong, and dramatic. The approach was based on an index of correlation coefficient calculated for the original time series and its Abrupt Change component. A bigger value of correlation coefficient reflects a higher significance level of Abrupt Change. Results of Monte-Carlo experiments verified the reliability of the proposed approach, and also indicated the great influence of statistical characteristics of time series on the significance level of Abrupt Change. The approach was derived from the relationship between correlation coefficient index and Abrupt Change, and can estimate and grade the significance levels of Abrupt Changes in hydrological time series. Application of the proposed approach to ten major watersheds in China showed that Abrupt Changes mainly occurred in five watersheds in northern China, which have arid or semi-arid climate and severe shortages of water resources. Runoff processes in northern China were more sensitive to precipitation Change than those in southern China. Although annual precipitation and surface water resources amount (SWRA) exhibited a harmonious relationship in most watersheds, Abrupt Changes in the latter were more significant. Compared with Abrupt Changes in annual precipitation, human activities contributed much more to the Abrupt Changes in the corresponding SWRA, except for the Northwest Inland River watershed.
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trend periodicity and Abrupt Change in streamflow of the east river the pearl river basin
Hydrological Processes, 2014Co-Authors: Qiang Zhang, Vijay P SinghAbstract:The East River in the Pearl River basin, China, plays a vital role in the water supply for mega-cities within and in the vicinity of the Pearl River Delta. Knowledge of statistical variability of streamflow is therefore important for water resources management in the basin. This study analyzed streamflow from four hydrological stations on the East River for a period of 1951–2009, using ensemble empirical mode decomposition (EEMD), continuous wavelet transform (CWT) technique, scanning t and F tests. Results indicated increasing/decreasing streamflow in the East River basin before/after the 1980s. After the early 1970s, the high/low flow components were decreasing/increasing. CWT-based analysis demonstrates a significant impact of water reservoirs on the periodicity of streamflow. Scanning t and F test indicates that significantly Abrupt Changes in streamflow are largely influenced by both water reservoirs construction and precipitation Changes. Thus, Changes of streamflow, which are reflected by variations of trend, periodicity and Abrupt Change, are due to both water reservoir construction and precipitation Changes. Further, the Changes of volume of streamflow in the East River are in good agreement with precipitation Changes. Copyright © 2012 John Wiley & Sons, Ltd.
